docker/swarmkit

package flagparser

import (
    "fmt"
    "strings"

    "github.com/moby/swarmkit/v2/api"
    "github.com/moby/swarmkit/v2/swarmd/cmd/swarmctl/common"
    "github.com/spf13/cobra"
)

// expects configs in the format CONFIG_NAME:TARGET_NAME
func parseConfigString(configString string) (configName, presentName string, err error) {
    tokens := strings.Split(configString, ":")

    configName = strings.TrimSpace(tokens[0])

    if configName == "" {
        err = fmt.Errorf("invalid config name provided")
        return
    }

    if len(tokens) > 1 {
        presentName = strings.TrimSpace(tokens[1])
        if presentName == "" {
            err = fmt.Errorf("invalid presentation name provided")
            return
        }
    } else {
        presentName = configName
    }
    return
}

// ParseAddConfig validates configs passed on the command line
func ParseAddConfig(cmd *cobra.Command, spec *api.ServiceSpec, flagName string) error {
    flags := cmd.Flags()

    if flags.Changed(flagName) {
        configs, err := flags.GetStringSlice(flagName)
        if err != nil {
            return err
        }

        container := spec.Task.GetContainer()
        if container == nil {
            spec.Task.Runtime = &api.TaskSpec_Container{
                Container: &api.ContainerSpec{},
            }
        }

        lookupConfigNames := []string{}
        var needConfigs []*api.ConfigReference

        for _, config := range configs {
            n, p, err := parseConfigString(config)
            if err != nil {
                return err
            }

            // TODO(diogo): defaults to File targets, but in the future will take different types
            configRef := &api.ConfigReference{
                ConfigName: n,
                Target: &api.ConfigReference_File{
                    File: &api.FileTarget{
                        Name: p,
                        Mode: 0444,
                    },
                },
            }

            lookupConfigNames = append(lookupConfigNames, n)
            needConfigs = append(needConfigs, configRef)
        }

        client, err := common.Dial(cmd)
        if err != nil {
            return err
        }

        r, err := client.ListConfigs(common.Context(cmd),
            &api.ListConfigsRequest{Filters: &api.ListConfigsRequest_Filters{Names: lookupConfigNames}})
        if err != nil {
            return err
        }

        foundConfigs := make(map[string]*api.Config)
        for _, config := range r.Configs {
            foundConfigs[config.Spec.Annotations.Name] = config
        }

        for _, configRef := range needConfigs {
            config, ok := foundConfigs[configRef.ConfigName]
            if !ok {
                return fmt.Errorf("config not found: %s", configRef.ConfigName)
            }

            configRef.ConfigID = config.ID
            container.Configs = append(container.Configs, configRef)
        }
    }

    return nil
}

// ParseRemoveConfig removes a set of configs from the task spec's config references
func ParseRemoveConfig(cmd *cobra.Command, spec *api.ServiceSpec, flagName string) error {
    flags := cmd.Flags()

    if flags.Changed(flagName) {
        configs, err := flags.GetStringSlice(flagName)
        if err != nil {
            return err
        }

        container := spec.Task.GetContainer()
        if container == nil {
            return nil
        }

        wantToDelete := make(map[string]struct{})

        for _, config := range configs {
            n, _, err := parseConfigString(config)
            if err != nil {
                return err
            }

            wantToDelete[n] = struct{}{}
        }

        configRefs := []*api.ConfigReference{}

        for _, configRef := range container.Configs {
            if _, ok := wantToDelete[configRef.ConfigName]; ok {
                continue
            }
            configRefs = append(configRefs, configRef)
        }

        container.Configs = configRefs
    }
    return nil
}